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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7ad68e67e54e271cd04993d104b9bc48b2ddc75ea9f770ed164b4b9aa4d9c9' 
  AND token = 'H578WRumNo3UnlsXOYP9kogR5ZRGJ7j8GuUnuSoEyQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}